only because .biz is currently undervalued
Info is a decent extension. But I think the potential for .US to be #2 after .com down the line is very real. Especially when you still have over 50% of US businesses without a website and view the future demand coming from local search. Biz is somewhere after those.
As far as typein traffic goes I can't see .us ever competing with .org which org's imo rank 2nd behind com in that regard. However, I do rank .us #3.
You rank .US ABOVE .NET???